Make up a fake invoice for your bike. If you get stopped at Customs, show them it. The chances of them phoning up the 'shop' and asking whether you bought the bike from them are so tiny that it's not worth worrying about
@Sano started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Make up a fake invoice for your bike. If you get stopped at Customs, show them it. The chances of them phoning up the 'shop' and asking whether you bought the bike from them are so tiny that it's not worth worrying about